Module No. 5682
Calibrating Altitude Readings (Offset)
To minimize the difference between locally indicated and measured values, you should update the reference altitude value (offset) before setting off and during treks or any other activities where you take altitude readings.
Also, you can ensure accurate measurements by checking a map local altitude indications or some other source for your current location’s altitude, and regularly calibrating watch readings with the latest information while mountain climbing.
You can find out the altitude at your current location from signs, maps, on the Internet, etc.
Differences between actual altitude and watch readings can be caused by the factors below.
Changes in barometric pressure
Changes in temperature caused by variations in barometric pressure and by elevation
Though altitude readings can be taken without calibration, doing so may produce readings that are very different from indications by altitude markers, etc.
Enter the Altimeter Mode.
Pull out the crown.
Rotate the crown to calibrate the displayed value to that of a local altitude (elevation) marker.
Push the crown back in to complete the setting operation.
This displays the current altitude and enters the Altitude Offset Mode.
Setting range: -3,000 to 10,000 meters
Setting unit: 1 meter (or 5 feet)
To return the altitude setting to its initial factory default, press (A) and (C) at the same time.
If you do not perform any operation for about two minutes after pulling out the crown, crown operations will automatically become disabled. If that happens, push the crown back in and then pull it out again.